Magneto-rotons in wide parabolic quantum wells

K. Karraï; X. Ying; H. D. Drew; M. Santos; M. Shayegan; S. R.E. Yang; A. H. MacDonald

doi:10.1016/0039-6028(92)90387-L

Magneto-rotons in wide parabolic quantum wells

K. Karraï, X. Ying, H. D. Drew, M. Santos, M. Shayegan, S. R.E. Yang, A. H. MacDonald

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The magneto-plasmon dispersion relation of a quasi-three-dimensional electron gas confined in a wide AlxGa_1-x As parabolic quantum well is investigated in the magnetic quantum limit. Magneto-plasma excitations polarized perpendicular to the magnetic field and with wave vector q of the order of the inverse magnetic length 1 l₀ are measured in far infrared magneto-transmission experiments on 100 nm thick electron slabs. A minimum is found in the magneto-plasma mode frequency at ql₀ ≈ 2 suggesting the existence of a magneto-roton excitation. The collective excitation spectrum is calculated in analogy with Feynman's theory for rotons in helium, and is found to be in good qualitative agreement with the measurement.

Original language	English (US)
Pages (from-to)	451-456
Number of pages	6
Journal	Surface Science
Volume	263
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(92)90387-L
State	Published - Feb 19 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/0039-6028(92)90387-L

Cite this

@article{4b346ef540e649aba81e164c3b4056a0,

title = "Magneto-rotons in wide parabolic quantum wells",

abstract = "The magneto-plasmon dispersion relation of a quasi-three-dimensional electron gas confined in a wide AlxGa1-x As parabolic quantum well is investigated in the magnetic quantum limit. Magneto-plasma excitations polarized perpendicular to the magnetic field and with wave vector q of the order of the inverse magnetic length 1 l0 are measured in far infrared magneto-transmission experiments on 100 nm thick electron slabs. A minimum is found in the magneto-plasma mode frequency at ql0 ≈ 2 suggesting the existence of a magneto-roton excitation. The collective excitation spectrum is calculated in analogy with Feynman's theory for rotons in helium, and is found to be in good qualitative agreement with the measurement.",

author = "K. Karra{\"i} and X. Ying and Drew, {H. D.} and M. Santos and M. Shayegan and Yang, {S. R.E.} and MacDonald, {A. H.}",

note = "Funding Information: We would like to thank L. Brey, J. Dempsey, H. Fertig, and J.P. Kotthaus for fruitful discussions. This work was supported,i n part, by NSF grant nos. DMR-90-00553a nd DMR-89-21073.",

year = "1992",

month = feb,

day = "19",

doi = "10.1016/0039-6028(92)90387-L",

language = "English (US)",

volume = "263",

pages = "451--456",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "1-3",

}

TY - JOUR

T1 - Magneto-rotons in wide parabolic quantum wells

AU - Karraï, K.

AU - Ying, X.

AU - Drew, H. D.

AU - Santos, M.

AU - Shayegan, M.

AU - Yang, S. R.E.

AU - MacDonald, A. H.

N1 - Funding Information: We would like to thank L. Brey, J. Dempsey, H. Fertig, and J.P. Kotthaus for fruitful discussions. This work was supported,i n part, by NSF grant nos. DMR-90-00553a nd DMR-89-21073.

PY - 1992/2/19

Y1 - 1992/2/19

N2 - The magneto-plasmon dispersion relation of a quasi-three-dimensional electron gas confined in a wide AlxGa1-x As parabolic quantum well is investigated in the magnetic quantum limit. Magneto-plasma excitations polarized perpendicular to the magnetic field and with wave vector q of the order of the inverse magnetic length 1 l0 are measured in far infrared magneto-transmission experiments on 100 nm thick electron slabs. A minimum is found in the magneto-plasma mode frequency at ql0 ≈ 2 suggesting the existence of a magneto-roton excitation. The collective excitation spectrum is calculated in analogy with Feynman's theory for rotons in helium, and is found to be in good qualitative agreement with the measurement.

AB - The magneto-plasmon dispersion relation of a quasi-three-dimensional electron gas confined in a wide AlxGa1-x As parabolic quantum well is investigated in the magnetic quantum limit. Magneto-plasma excitations polarized perpendicular to the magnetic field and with wave vector q of the order of the inverse magnetic length 1 l0 are measured in far infrared magneto-transmission experiments on 100 nm thick electron slabs. A minimum is found in the magneto-plasma mode frequency at ql0 ≈ 2 suggesting the existence of a magneto-roton excitation. The collective excitation spectrum is calculated in analogy with Feynman's theory for rotons in helium, and is found to be in good qualitative agreement with the measurement.

UR - http://www.scopus.com/inward/record.url?scp=0026818719&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026818719&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(92)90387-L

DO - 10.1016/0039-6028(92)90387-L

M3 - Article

AN - SCOPUS:0026818719

SN - 0039-6028

VL - 263

SP - 451

EP - 456

JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

Magneto-rotons in wide parabolic quantum wells

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this